odradek
lvl.2
Flight distance : 1817087 ft
France
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Jenee 2 Posted at 2017-4-28 21:58
Towards the end of the video, you can hear the motors reving up and down. Not sure why as it appeared to be flying level. At the very end, the motors sound like the power has been reduced and then immediately you can hear it hitting the ground still with a small amount of power. It all motors had stopped in the air, there should have been a longer break between the motors shutting down and the drone hitting the ground.
Well, it's difficult to get a real account of what happened only from the sound of the video because, as I have stated here several times, the drone was 1.5 meters highe, maybe even less. So, the lapse of time between the stop of the motors and the crash was very very short.
What I'm sure of is that I very distinctly saw the motors stop. When I say 'stop', I mean that, instead of the blurry circle made by propellors in motion, I could see very distinctly each propellor stop moving and, then, instantly, the drone fall down on the ground. If the motors had slowed down but not stop, it would have fallen on the ground but not like rock free falling as it did. This I'm sure of. All the rest, the noises, the GPS, etc. I don't know for sure, as I'm a newbee, but the sudden stop of the propellors mid-air, this I'm sure of because I saw it in front of me.
Frankly, I'd prefer to find out that I am responsible for this and be able to correct it by changing what I would have done wrong, but, unfortunately, at the moment, most of the pieces of evidence tend to show that it is a manufacture default :
1) It happened to several MAVIC owner recently
2) 2 of them at least had their drone built the day after mine (probably same batch)
3) My DAT file indicate a drop of power from 11 to 7 volts all of a sudden on the 4 motors at the very end of the crash. (cf post 25#)
4) I think, from what I saw and did, that it is not the normal behaviour of a drone to shut all the motors at once in any other circumtances than after landing or with a battery down. Especially when you think that this drone is a tech marvel full of securities of all sorts. |
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